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1、MEF ProtectionWork,Pascal MenezesTechnical ContributorJune 3rd 2003,Agnostic to any transport and its related protection schemes.Agnostic to any topologyDoes not rely on a certain topology for protection(ex:ring)Can work with any topology(ring,mesh,mixed,etc)Degree of protection is dependent on the
2、richness of the redundancy of the topology Co-exist with any transport protection schemes(ex:SONET,RPR,802.1d.Primarily designed for the protection of EVCs.Based on MPLS based schemes because of the layer 2 service work in IETF for PPVPN(ex:VPLS,VPWS,etc)and PWE3 WGs.This was the scheme chosen becau
3、se of scalability and inter-MEN connectivity advantages.It is transparent to IEEE schemes(STP,Link Agg,etc)and it assumes IEEE protection schemes are part of the protection of an Ethernet transport mechanism(ie:it is part of the transport mechanism of the provider).Subscribers protection scheme is t
4、ransparent(ie:STP,multi-homed)Extensions to the PRMs for IEEE based technologiesLooking into 802.1ad work and how to extend the framework interworking,Motivations,Work done in the MEF Protocol and Transport GroupProtection Requirements DocumentStatus is Straw BallotProtection Framework DocumentStatu
5、s is Straw BallotMPLS Protection Implementation AgreementStatus is Straw Ballot,MEF Protection Work Items,MEF Architecture External Reference Model,Subscriber,MEFUNI,Ethernet,Interworking,NNI,Metro Ethernet,Network(MEN),Autonomy X,Other,Transport,Networks,Network,Interworking,NNI,Metro Ethernet,Netw
6、ork(MEN),Autonomy X,Service,Interworking,NNI,Other Service Networks,(Internet,PPP,FR,ATM),Metro Ethernet,Network(MEN),Autonomy Y,Network,Interworking,NNI,Subscriber,MEF UNI,Subscriber,OtherUNIs,Subscriber,MEFUNIs,802.3,PHY,ATM VP,HOVC,STM-N,ATM VC,HOVC,STM-N,LOVC,HOVC,STM-N,MPLS,802.3PHY,OTUk,OCh,OT
7、M-n,ODUk,other,MPLS,PDH,Other,IP,MEN Applications(Voice,Video,Data,etc),IP,HOVC,STM-N,MPLS,MPLS VC,TransportLayer(s),ApplicationServicesLayer(s),IP,TCP/UDP,OtherProtocolSuite(s),Transport Layers,Application Layers,Ethernet Services,Medium(Fiber,Copper,Coax,wireless,etc.),EthernetServiceLayer,Etherne
8、t Layer,MEN Layered Model,MEF Ethernet Virtual Connection(EVC)Model,MetroEthernetNetwork,CustomerEdge(CE),CustomerNetwork,NetworkElement,NetworkElement,NetworkElement,NetworkElement,CustomerNetwork,CustomerEdge(CE),UserNetworkInterface(UNI),UserNetworkInterface(UNI),EthernetVirtualConnection(EVC),UN
9、I=Service AttributesEVC=Service Attributes,Protection switching times.Failure detection requirementsProtection resource allocation requirementsTopology requirementsFailure notification requirementsRestoration and revertiveness requirementsTransparency for end userSecurity requirements,MEF Protection
10、 Requirements,Connectivity restoration timeSub 50msecSub 200msecSub 2 secSub 5 secProtection type1+11:11:nm:1m:nRevertive or non-revertive modeReversion timeDegrade condition threshold(ex:packet loss)QoS preservation,End to End Protection Service Level Specifications,OtherTransport(Protection),Ether
11、net(No Protection),CE,Metro Ethernet Network(MEN),CE,End-to-End Protection Service Level Specification(SLS),TransportSub-Network,TransportSub-Network,TransportSub-Network,OtherTransport(Protection),Transport&Protection SLS,BackboneRing,NE,NE,NE,NE,Access Ring,NE,NE,NE,NE,Access Mesh,WAN 1,BackboneRi
12、ng,Access Ring,NE,NE,NE,NE,NE,NE,Access Mesh,NE,NE,Metro Ethernet Network(MEN),End-to-End Protection Service Level Specification(SLS),WAN 2,Topology&Protection SLS,MEF Protection Reference Model(PRM),End to End Path ProtectionEEPP,Aggregated Line andNode ProtectionALNP,MEF Protection Mechanism,Topol
13、ogy,Transport,Ethernet Services Parameters(Protection EVC Service Attributes,Traffic Parameters,etc),Service Level AgreementsSLA,Application Protection Constraint PolicyAPCP,End-to-End Path Protection(EEPP),Aggregated Line&Node ProtectionALNP,Topology,Transport,ALNP Backup LSPs 1+1 EEPP Protection T
14、ype 50 Msec Restoration Time QoS Preserved,Protection Service Level Specification,Application Protection Constraint Policy,99.999 Availability Packet loss Delay Jitter,Subscriber Service Level Agreement,Application Protection Constraint Policy(APCP),EVC Availability EVC MTTR etc.,Ethernet Service At
15、tributes,Ethernet Services Parameters,NE,NE,IngressNE,NE,NE,EgressNE,Aggregated Line and Node Protection(ALNP),Aggregated Node and Line Protection(ALNP),CEA,NE3,NE8,NE4,NE9,CEZ,NE10,NE2,NE5,NE7,NE1,NE6,NE,NE,NE,IngressNE,NE,NE,EgressNE,NE,End-to-End Path Protection(EEPP),Redundant Network,PrimaryNet
16、work,End-to-End Path Protection(EEPP),CEA,NE3,NE8,NE4,NE9,CEZ,NE10,NE2,NE5,NE7,NE1,NE6,BackboneRing,NE,NE,NE,NE,Access Ring,NE,NE,NE,NE,Access Mesh,WAN 1,BackboneRing,Access Ring,NE,NE,NE,NE,NE,NE,Access Mesh,NE,NE,Metro Ethernet Network(MEN),WAN 2,NE,NE,NE,NE,NE,NE,PRM Example,Protection And Protec
17、tedTransport Sub-Networks,Generic approach PRM interoperability with any kind of transport/topology/protected MPLS-subnetwork/logical-link.Failures within the protected-transport/subnetwork are provided by itself.PRM is required for completing the solution in the border between the protected transpo
18、rt/subnetwork and other subnetworks.Requires indications from the lower layer.Indications achieved either by the lower-layer or by an OA&M procedure that operates above it.PRM does not require knowledge of internal structure of the protected subnetwork.,PRM and Protected Transport Sub-Networks,NE,NE
19、,NE,NE,CE,NE,NE,NE,NE,CE,NE,NE,NE,NE,PRM and RPR,RPRSub-Network,No protection needed,GELinks,RPRSub-Network,Protection needed,Two rings,each protected by technology-specific means,interconnected with point-to-point links.PRM is required for protecting the P2P links and the border nodes(for example,p
20、rotection tunnel for node A in blue).,A,PRM and SONET,SONETSub-Network,SONETSub-Network,A topology containing protected-transport subnetwork as well as unprotected P2P links.,Example Network,Unprotected link,Failures within the protected subnetwork are protected by its native capabilities.Failure of
21、 border nodes like node A are not protected by the transport/subnetwork.,Where is PRM Needed?,Protection-tunnels are required only for protection of border nodes(unprotected links/nodes).Failure of a link leading to the border node activates the operation of PRM switch to the protection tunnel.,PRM
22、Operation in Protected Transport Sub-Networks,When the failed node is at the exit of an LSP from the protected subnetwork,the entry node is the one to activate the PRM switch to the protection tunnel.This requires receipt of indication about the failure from the protected transport subnetwork or MPL
23、S OAM/Hello.,PRM and Egress Border Failure Case,Some transports have means for indicating about failures and about their type and place.OAM procedures on LSPsHeartbeat on links:ex:RSVP Hello Ext.,Node Failure Indications in Protected Transport Subnetworks,The PRM scheme is generalized to interoperat
24、e with protected-transports/unprotected-transports/protected-subnetworks/logical-links.PRM does not have knowledge of internal structure of the protected subnetwork.Protected subnetworks can use any kind of protection mechanism.Subscribers protection mechanisms are transparentThe PRM is a multi-layers protection model that co-exist together.,Summary,Thank You,
